I understand where you are coming from, but to be frank I've never seen it interpreted that way. From what I see in 99% of games/stories, the Lesbian tag isn't for exclusively Lesbian relations, but rather to indicate there are F+F sexual encounters or relationships. Selfish Harem has a bit of a mean connotation to it.
You make absolutely amazing games, your renders are great and the concepts seem really cool. It's too bad we can't have it both ways with content filters (I understand its too much work for you, specially if you work alone), but I guess that's just a me problem. I was the one that foolishly got invested in a story that would hurt me. When I played A Petal Among Thorns I did get my spidey-senses warning me Bliss was going to hurt me, playing up to the first real conversation with her in AMoB just confirmed it.
Edit: "with the MC present at this point", this does imply there will be without him, no?